define hello so that it contains only a yield statement,



then call the new version of hello with a block (the code in braces).

def hello
  yield
end

hello { puts "Hello, Matz!" } # => Hello, Matz!

1.	A block is a section of code that can be passed to a method much like passing an argument.
2.	use code blocks with Ruby iterators like each, upto, downto, and times
3.	block is invoked in conjunction with a method.
4.	Place a space between the pipes ( \| ) and the variable names
5.	Code Blocks and each method
6.	A code block is an anonymous, nameless method or function.
7.	print all the elements in an array using the each method followed by a block
8.	convert a block into an object.
9.	1.upto(5) { ...code to loop here... }
10.	10.downto(5) { ...code to loop here... }
11.	0.step(50, 5) { ...code to loop here... }
12.	1.upto(5) { \|number\| puts number }
13.	Nested block logics
14.	Running a Code Block Periodically
15.	block pointer

define hello so that it contains only a yield statement, : Code Block « Method « Ruby